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PROBLEMSMehmet Sahin, Marcos Donnantouni, La Plata, José H. Nieto, Cosmin Pohoata, Jody M. Lockhart, William P. Wardlaw, Christopher J. Hillar, Ovidiu Furdui, Michael W. Botsko, Mowaffaq Hajja, G.R.A.20 Problem Solving Group, Philip Benjamin, H. A. ShahAli, John H. Smith, Götz Trenkler, Eugene A. Herman, Dorin Marghidanu, Michel Bataille, Jeff Groah, Vadim Ponomarenko and Jerrold W. Grossman · Mathematics Magazine · 2009